The best jigsaw puzzle for adults can vary depending on personal preferences, but here are some factors to consider when choosing a jigsaw puzzle:

1. Difficulty Level: Consider the number of pieces and complexity of the image. For adults, puzzles with higher piece counts (500 pieces and above) often provide a more challenging and engaging experience.
2. Image or Theme: Choose a puzzle with an image or theme that interests you. It could be landscapes, famous artworks, animals, cities, or any other subject matter that appeals to you personally.
3. Quality: Look for puzzles made from high-quality materials with precise cuts and sturdy pieces that fit well together. Brands known for quality puzzles include Ravensburger, Buffalo Games, and White Mountain Puzzles, among others.
4. Size: Consider the size of the finished puzzle and the space you have available for assembling it. Some puzzles can be quite large and may require a dedicated table or space.
5. Reviews and Recommendations: Check reviews and recommendations from other puzzle enthusiasts to get an idea of the overall quality, difficulty, and enjoyment of a particular puzzle.

Ultimately, the best jigsaw puzzle for adults is one that aligns with your interests, offers an appropriate level of challenge, and is made with high-quality materials. It’s often a personal choice based on individual preferences and tastes.